I am doing a Pelican case 1450 for a customer. It is PP and I understand the general plastic prep requirements and such but my question is more about the best way to go about prepping it for dipping. There does not seem to be any way to separate the lid from the base via the metal pins. Has anyone done one of these and if so.... how did you prep/mask the case as well as any dipping techniques that work well. Thank you in advance.